Edge Filters

Edge filters separate a broad spectrum of light into two components: a transmitted component and a rejected component. Unlike dichroic filters, edge filters may provide rejection through a combination of absorption and reflection and are not specifically designed to provide a useful reflection band. These filters are defined by either a cut-on or a cut-off slope establishing the transition between a region of high rejection and a region of high transmission. Cut-on and cut-off edges are typically defined by long wave or short wave pass filter coatings.

Long wave pass edge filters have a region of rejection on the short-wavelength side of the cut-on wavelength. This rejection region can be provided by an absorbing element such as colored glass, dyed epoxy, or other light absorbing element, or it can be provided by thin-film coatings. Conversely, short wave pass edge filters have a region of rejection on the long-wavelength side of the cut-on wavelength. Although some rejection on short wave pass filters can be provided by absorptive materials, the majority of the rejection is accomplished using thin-film coatings.

Edge filters can be deployed in a diverse range of applications ranging from clinical chemistry analyzers to grain harvest process control.

To discuss your specific requirements, please call 508-528-4411 to speak directly to one of our Technical Sales Engineers, or email us at filters.sales@newport.com.

While the vast majority of the edge filters that we manufacture are custom designed for OEM instrumentation, we also manufacture a selection of catalog products that are available for immediate delivery from inventory including Colored Glass Alternative long wave pass filters, Colored-Glass long wave pass filters, and basic-research long and short wave pass filters.

Colored-Glass Alternative
Custom Specified Edge
UV-VIS Long & Short Pass